Long-stroke pumping jack



Dec. 11, 1928. 7 1,694,402

H. J. SMITH LONG STROKE PUMPING JACK Filed July 14, 1926 2 Sheets-Sheet1 .zwvmron. HUBER-T .1 SMITH.

H. J. SMITH LONG STROKE PUMPING JACK Dec. 11, 1928,

Filed July 14, 1926 2 Sheets-Sheet 2 I/VVf/V ran. Husmr J. SM/ 124.

,4 TTOIM/E y Patented Dec. 11, 19.28.

HE f5 raras HUBERT J. snrrn, or LONG canon, CALIFORNIA.

LUNG-STROKE Application filed July 14,

An object of my invention is to provide a long stroke pumping jack whichmay be readily and quickly removed when it is desired to work on thewell.

Another object is to provide a simple and less expensive pumping jackand one which I is effective in operation.

Other objects, advantages, and features of invention may appear from theaccompanying drawings, the subjoined detailed description and theappended claims.

In the drawings Fig. l is a side elevation of my invention.

Fig. 2 is an end View of the same.

Fig. 3 is a fragmentary side elevation, with parts broken away, of thedrive shaft support.

Fig. 4 is an enlarged sectional view taken on line 44 of Fig. 1.

Referring more particularly to the drawings, my pumping jack comprises adrive shaft supporting frame 1 which is fixed to the floor of thederrick and which is positioned to one side and out of the way of thewell casing 2. The cross head frame 3 is removably positioned adjacentthe casing 2, and is not connected to the frame 1.

The frame 1 comprises two pair of angularly positioned legs 4, 5, whichare secured together at their upper ends by the bolt 6. Bearings 7, 7are secured to the upper ends of the legs 4, 5 and a drive shaft 8 isjournaled in said bearings. The shaft 8 is rotated by means of a chain 9which encircles a sprocket wheel 10 on said shaft and a sprocket wheel11 on the band wheel 12 which wheel is driven by the usual engine (notshown). The legs 4, 5 rest in socket plates 13, 14 secured to the floorof the derrick, thus holding the frame 1 securely in position. A guyrope 15 may be secured to the top of the frame 1 to overcome the pull ofthe chain 9.

The cross head frame 3 comprises a pair of spaced channel bars 16, 17 inwhich the cross head 18 travels; said bars being secured together bycross ties 19-19. The frame 3 is supported and held upright on a pair ofside legs 2020 and a rearwardly extending leg 21. Guy wires 2222 extendfrom the top of the frame 3 and are removably secured to the floor ofthe derrick by suitable means such as turn buckles 23. Guy wires 24, 24extend from approximately the center of the frame 3 to further steadythe same. These guy wires are also removably secured to the floor of thederrick 1n the same manner as preruivrrrne JACK.

1929. Serial No. 122,279.

viously described. It will therefore be seen that by removing the guywires 22-24 the frame 3 'can be quickly shifted away from the wellcaslng 2, so that the well may be worked crank 11111125 is secured toone end -o'f-the shaft 8, and a connecting rod 26 is journaled on a pin27 on said arm, and upon a pin 28 on the cross'head 18, whereby thecross head is reciprocated in the guides 16-17. A second crank arm 29 issecured to the end of the shaft 8 opposite the crank 25 and a pitman 30extends from the arm 29 to a counter weight 31, said counter weightserving to. balance the weight of the sucker rods, fluids etc. in thewell.

A pin 32 is provided on the cross head 18, and a hole 33 is providedtherein through which the polish rod 34 extends. A clamp 35 on the rod34 rests against the pin 32 when the rod is pulled upwardly and if anobstruction stops the rod on the downward movement it can readily slidethrough the hole 33.

It will be evident from the foregoing description that rotation of thecrank 25 will reciprocate the cross head 18 and operate the pump in thewell. made any length to give the stroke desired.

Having described my invention I claim:

1. A long stroke pumping jack for wells having a pump and rod comprisinga supporting frame, a drive shaft journaled on said frame, a cross headframe removably positioned adjacent thewell and unattached to saidsupporting frame, a cross head reciprocally mounted in said crossheadframe, means coupling said cross head to the well pump rod, means torotate said shaft, a crank arm on said shaft, a connecting rod joiningsaid crankarm and cross head, a second arm on said shaft, a pitmandepending from said sec-' ond arm and a counterweight secured to saidpitman.

'2. A long stroke pumping jack for wells having a pump and rod,comprising a supporting frame formed of two pairs of angularlypositioned legs, a drive shaft journaled on said frame, a cross-headframe removably positioned adjacent the well, legs supporting said crosshead frame, a cross head reciprocally mounted in said'cross head. frame,a pin on said cross'head through which the pump rod extends, means torotate said shaft, and means coupling said shaft and cross head wherebythe cross head is reciprocated.

3. A long stroke pumping jack for wells The crank 25 may be til having apump and rod, comprising a supporting frame formed of two pairs ofangularly positioned legs, a drive shaft journaled on said frame, across-head frame removably whereby the cross head is recipiocated, guy

Wires reinovably secured to the cross head frame, and counter-balancemeans on said shaft. I

'4. A long stroke pumping jack for Wells having a pump and rod,comprising a supporting frame formed of two pairs of angularlypositioned legs, a drive shaft journaled on said frame, a cross-headframe removably positioned adjacent the Well, legs supporting said crosshead frame, a cross head reciprocally lnountedin said cross head frame,a pin on said cross head through Which the pump rod extends, means torotate said shaft, and means coupling said shaft and cross head wherebythe cross head is reciproeated, guy

Wires 'removably secured to the cross headframe, a second arm on saidshaft, a pitman depending from said second arm and a counterweightsecured to said pitman. V

In testimony whereof I afli x my signature.

HUBERT J. SMITH.

